Hydraulic machine, in particular hydraulic pressure exchanger

• US 9,556,736 B2
• Filed: 08/04/2014
• Issued: 01/31/2017
• Est. Priority Date: 08/15/2013
• Status: Active Grant

• Current Assignee: Danfoss A/S
• Original Assignee: Danfoss A/S
• Inventors: Sigurdsson, Haraldur
• Primary Examiner(s): Kramer, Devon
• Assistant Examiner(s): ZOLLINGER, NATHAN C
• Application Number:
  US14/450,574
• Publication Number:
  US 20150050164A1
• Time in Patent Office: 911 Days
• Field of Search: 417/64, 60/394.5
• US Class Current: 1/1
• CPC Class Codes: F01B 3/0032 having rotary cylinder block
• CPC Class Codes: F04B 1/20 having rotary cylinder block
• CPC Class Codes: F04B 1/24 inclined to the main shaft axis
• CPC Class Codes: F04B 17/00 Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04B 9/109 having plural pumping chambers
• CPC Class Codes: F04B 9/117 the pumping members not being mechanically connected to each other
• CPC Class Codes: F04F 13/00 Pressure exchangers

Abstract

A hydraulic pressure exchanger comprising a drum rotatable about an axis, a front plate arrangement having a front plate and a pressure shoe, said drum including a plurality of working cylinders, each working cylinder having a front opening and, during rotation of this drum, said front opening sliding over said pressure shoe along a path, said pressure shoe having at least two kidney-shaped openings, said kidney-shaped openings being arranged in said path. The hydraulic pressure exchanger should be operated with low noise. To this end said pressure shoe is arranged between said drum and said front plate and comprises at least one pressure cylinder arranged between two neighboring kidney-shaped openings, a piston being arranged in said pressure cylinder and resting against said front plate, said pressure cylinder being connected with a supply opening in a side of the pressure shoe opposite said front plate, said opening at least partly overlapping said path.

Claims

1. A hydraulic pressure exchanger comprising a drum rotatable about an axis, a front plate arrangement having a front plate and a pressure shoe, said drum comprising a plurality of working cylinders, each working cylinder having a front opening, during rotation of said drum, each front opening sliding over said pressure shoe along a path, said pressure shoe having at least two kidney-shaped openings, said kidney-shaped openings being arranged in said path, wherein said pressure shoe is arranged between said drum and said front plate and comprises at least one pressure cylinder arranged between two neighboring kidney-shaped openings, a piston being arranged in at least one pressure cylinder, said piston resting against said front plate, said at least one pressure cylinder being connected with a supply opening in a side of the pressure shoe opposite said front plate, said supply opening at least partly overlapping said path.

2. The hydraulic pressure exchanger according to claim 1, wherein at least two pressure cylinders are arranged between two neighboring kidney-shaped openings, one behind the other in a direction of movement of said working cylinders.

3. The hydraulic pressure exchanger according to claim 1, wherein said supply opening is arranged eccentrically relative to a center of said at least one pressure cylinder.

4. The hydraulic pressure exchanger according to claim 1, wherein the center of said at least one pressure cylinder is arranged closer to the axis than said supply opening.

5. The hydraulic pressure exchanger according to claim 1, wherein said at least one pressure cylinder overlaps at least partially said path.

6. The hydraulic pressure exchanger according to claim 1, wherein the pressure shoe comprises a first port and at least one pressing cylinder, said at least one pressing cylinder opening to said front plate, a pressing piston being arranged in said at least one pressing cylinder, said at least one pressing cylinder being in fluid contact with said first port.

7. The hydraulic pressure exchanger according to claim 1, wherein at least two pressing cylinders are arranged in said pressure shoe.

8. The hydraulic pressure exchanger according to claim 7, wherein said pressing cylinders have the same cross section area.

9. The hydraulic pressure exchanger according to claim 6, wherein said pressure shoe comprises the first port and a second port on a side facing said first front plate, said first and second ports having a minimum distance along a straight line, said at least one pressing cylinder being offset to said straight line by a predetermined displacement.

10. The hydraulic pressure exchanger according to claim 9, wherein said at least one pressing cylinder is arranged between said first and second ports.

11. The hydraulic pressure exchanger according to claim 2, wherein said pressure cylinder overlap at least partially said path.

12. The hydraulic pressure exchanger according to claim 3, wherein said at least one pressure cylinder overlaps at least partially said path.

13. The hydraulic pressure exchanger according to claim 4, wherein said at least one pressure cylinder overlaps at least partially said path.

14. The hydraulic pressure exchanger according to claim 2, wherein the pressure shoe comprises a first port and at least one pressing cylinder, said at least one pressing cylinder opening to said front plate, a pressing piston being arranged in said at least one pressing cylinder, said at least one pressing cylinder being in fluid contact with said first port.

15. The hydraulic pressure exchanger according to claim 3, wherein the pressure shoe comprises a first port and at least one pressing cylinder, said at least one pressing cylinder opening to said front plate, a pressing piston being arranged in said at least one pressing cylinder, said at least one pressing cylinder being in fluid contact with said first port.

16. The hydraulic pressure exchanger according to claim 4, wherein the pressure shoe comprises a first port and at least one pressing cylinder, said at least one pressing cylinder opening to said front plate, a pressing piston being arranged in said at least one pressing cylinder, said at least one pressing cylinder being in fluid contact with said first port.

17. The hydraulic pressure exchanger according to claim 5, wherein the pressure shoe comprises a first port and at least one pressing cylinder, said at least one pressing cylinder opening to said front plate, a pressing piston being arranged in said at least one pressing cylinder, said at least one pressing cylinder being in fluid contact with said first port.

18. The hydraulic pressure exchanger according to claim 2, wherein at least two pressing cylinders are arranged in said pressure shoe.

19. The hydraulic pressure exchanger according to claim 3, wherein at least two pressing cylinders are arranged in said pressure shoe.

20. The hydraulic pressure exchanger according to claim 4, wherein at least two pressing cylinders are arranged in said pressure shoe.